A GMAT Strengthen Trap: Information About Not Acting Isn't Support for Acting
A GMAT Strengthen answer choice can name the right plan and still fail to support it, if it describes what happens without the plan instead of what happens because of it. This post breaks down the No-Action Trap using an Official GMAT congestion-pricing question, and the one check that catches it every time.
.png)
This GMAT Critical Reasoning Strengthen question opens, "The heavy traffic in Masana is a growing drain on the city's economy," and tests whether students can tell the difference between a choice that describes the cost of inaction and one that actually supports a plan's success.
You have to strengthen the conclusion that a plan will be successful, and you see an answer choice, and some part of you exhales. The exact plan the conclusion discusses, and the impact if it is not implemented, decorated with a growth rate or a dollar figure, it reads like proof. It feels concrete.
The question setup
Officials in a city with a serious traffic problem propose congestion pricing, a fee for drivers entering the busiest areas during peak hours. The question asks what would most strengthen the case that this plan will work. You can watch the full video solution here on the GMAT Quiz Master YouTube channel.
The No-Action Trap
One choice tells you that without congestion pricing, traffic is projected to grow by a specific percentage over the next few years. Same city. Same traffic problem. Same plan even gets named. Everything about it signals relevance.
Except go back to the conclusion. It's not "traffic is a serious problem." It's not "something needs to be done." It's specifically that this plan, once implemented, will succeed. The choice you're looking at describes a world where the plan is never introduced. It tells you nothing about what happens once it is. Knowing that inaction makes things worse doesn't tell you whether this particular action can fix them. The conclusion is asking whether the plan will work. This choice is answering whether doing nothing is costly. Those are two different questions, and a specific number attached to the second one doesn't make it an answer to the first.
The correct answer, by contrast
The correct choice points to congestion pricing's effect elsewhere: in other cities, it strongly encouraged carpooling, which lowered traffic. This doesn't prove the Masana plan will succeed. It doesn't need to. It raises the belief that the plan can work, and a strengthener only needs to raise belief, not prove the conclusion.
The habit this builds
This is the No-Action Trap, and it doesn't rely on you misreading the choice. You'll usually understand it correctly. It relies on you not checking which direction the conclusion is actually pointing before you decide whether a choice supports it.
The fix isn't complicated, but it takes discipline: before you select any answer choice, verify that it is aligned with what the correct answer choice needs to convey. That's why we think through what the correct choice should convey in terms of the exact conclusion in front of us, before we ever start evaluating individual choices. Do that here, and a choice built around what happens if the plan is never implemented won't even get a second look, it was never trying to convey the right thing in the first place.
Series context
This question is part of a Strengthen Beginner Series, worked through question by question, trap by trap. The full playlist is on the GMAT Quiz Master YouTube channel. Solve the question on your own first. The reasoning you apply matters more than the answer you reach.
Read about other Strengthen Traps and Tips: